nix-config/.archlinux/install-scripts/004-postinstall

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#!/bin/sh
#
# Common post-install system configuration that doesn't involve any
# external packages (besides fish)
#
# https://wiki.archlinux.org/index.php/General_recommendations
set -xe
echo -n "Enter a username for the local account with administrative rights: "
read USERNAME
# Start and enable the DHCP client daemon service
systemctl start dhcpcd.service
systemctl enable dhcpcd.service
# Set the timezone with systemd, and sync it periodically with a remote server
timedatectl set-timezone America/New_York
timedatectl set-ntp true
# Change the systemd wait time from 90s to 30s, mitigating a potential hang at shutdown
echo "DefaultTimeoutStartSec=30s" >> /etc/systemd/system.conf
echo "DefaultTimeoutStopSec=30s" >> /etc/systemd/system.conf
# Enable colors in pacman by uncommenting the Color line.
sed -i '/Color/s/^#//g' /etc/pacman.conf
# Give users in the wheel group permission to use sudo
echo "%wheel ALL=(ALL) ALL" >> /etc/sudoers
# Create a new user account with sudo privileges and the fish shell.
arch-chroot /mnt useradd -m -g users -G wheel -s /usr/bin/fish "$USERNAME"
# Then, set the password equal to the username (change this later).
echo "$USERNAME:$USERNAME" | chpasswd